Where is the size chart ?
Frank L Correct, similar to children's clothes sizing.
YAZMIN D I couldn't find a sizing chart either, so I just guessed that they were sized the same way that children's clothes are and it was about right. My 30 lb, 36" tall 2 year-old fit just fine in the size 2 wetsuit. If anything I would say that they are sized a little large. So, being that it's made of stretch neoprene, I might order one size small if you want it to fit correctly as soon as you receive it..